Katsuhiko Teshigawara (勅使河原 克彦 Teshigawara Katsuhiko) is a close friend of Mitsuha's. He is an expert with machinery. He, along with Sayaka, were the only people that helped Mitsuha with her plan to save the town people from the comet.

Towards the end of the movie, it is shown that he and Sayaka are in a cafe where Taki is. They're having a conversation about wedding styles for themselves.

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In an interview, Makoto Shinkai revealed that Tessie is an image of his own childhood, as his parents were running a construction company and forced him to take over the business one day, just like Tessie in the movie.[1]